Donkia glaciers -- Moraines -- Dome of ice -- Honey-combed surface -- Rocks of Donkia -- Metamorphic action of granite veins -- Accident to instruments -- Sebolah pass -- Bees, and May-flies -- View -- Temperature -- Pulses of party -- Lamas and travellers at Momay -- Weather and climate -- Dr. Campbell leaves Dorjiling for Sikkim -- Leave Momay -- Yeumtong -- Lachoong -- Retardation of vegetation at low elevations -- Choongtam -- Landslips and debacle -- Meet Dr. Campbell -- Motives for his journey -- Second visit to Lachen valley -- Autumnal tints -- Red currants -- Lachen Phipun -- Tungu -- Scenery -- Animals -- Poisonous rhododendrons -- Fire-wood -- Palung -- Elevations -- Sitong -- Kongra Lama -- Tibetans -- Enter Tibet -- Desolate scenery -- Plants -- Animals -- Geology -- Cholamoo lakes -- Antelopes -- Return to Yeumtso -- Dr. Campbell lost -- Extreme cold -- Headaches -- Tibetan Dingpun and guard -- Arms and accoutrements -- Temperature of Yeumtso -- Migratory birds -- Visit of Dingpun -- Yeumtso lakes. On the 20th of September I ascended to the great Donkia glaciers, east of Momay; the valley is much longer than that leading to the Kinchinjhow glacier, and at 16,000 or 17,000 feet elevation, containing four marshes or lakes, alternating with as many transverse moraines that have dammed the river. These moraines seem in some cases to have been deposited where rocks in the bed of the valley obstructed the downward progress of the ancient glacier; hence, when this latter finally retired, it rested at these obstructions, and accumulated there great deposits, which do not cross the valley, but project from each side obliquely into it. The rocks _in situ_ on the floor of the valley are all _moutonneed_ and polished on the top, sides, and face looking up the valley, but are rugged on that looking down it: gigantic blocks are poised on some. The lowest of the ancient moraines completely crosses the river, which finds, its way between the boulders.